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Wood Fillers for Windows

A range of window fillers for filling gaps, cracks and holes in wooden window frames and sills in preparation for refinishing with an interior wood oil, stain or other suitable wood finish. These strong and effective wood fillers will suit any project, whether softwood or hardwood window sills, new or old wooden window frames.

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Displaying 13 products

  4.8/5.0  (225)
A flexible, silicon-free mastic for filling joint gaps in window frames.
  • 1 coat
  • 24 hrs drying time
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Available in 310ml
  4.8/5.0  (80)
Quick spot repairs to your window frame - just scrape and fill with these wax filler sticks.
  • 2 mins drying time
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Available in 40g
  4.9/5.0  (50)
The strongest two-part wood filler we know. Available in many wood shades.
  • 15 mins drying time
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Available in 30ml, 750ml
  4.7/5.0  (49)
A strong, fast drying two-part wood filler that can be stained.
  • 30 mins drying time
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Available in 275g, 550g, 1kg
  5.0/5.0  (8)
A one part acrylic sealant that can be used for filling and repairing gaps and splits on exterior wood.
  • 1 hr drying time
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Available in 310ml
  5.0/5.0  (2)
For repairing finished interior wooden furniture. Fills small to medium holes, cracks and scratches. Quick drying and easy to use.
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Available in 50g
  5.0/5.0  (18)
Soaks deep in to rotten timber to strengthen and reinforce softened wood.
  • 1 coat
  • 2 hrs drying time
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Available in 250ml, 500ml
  5.0/5.0  (5)
Ideal for small repairs. Suitable for interior and exterior use.
  • 2 hrs drying time
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Available in 250g, 465g, 930g
  5.0/5.0  (2)
A water-based, multi-purpose wood filler for interior and exterior use.
  • 2 hrs drying time
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Available in 125ml
  5.0/5.0  (4)
A high performance, 2 part wood filler for repairing damage caused by wet rot and for major joinery repairs.
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Available in 250g, 500g, 750g
A tough, durable, flexible wood filler for small repairs. Suitable for interior and exterior use.
  • 2 hrs drying time
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Available in 250ml, 310ml, 500ml
  4.0/5.0  (1)
A rapid drying wood hardener for repairing decayed wood and all major joinery repairs. Provides a firm base for filling with Cuprinol Ultra Tough Wood Filler.
  • 2-3 coats
  • 2 hrs drying time
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Available in 500ml
  4.6/5.0  (2)
A high strength, two pack wood filler ideal for filling larger areas. Rapid curing and superb adhesion.
  • 30 mins drying time
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Available in 350ml